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https://issues.apache.org/jira/browse/CAMEL-25526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on CAMEL-25526 started by shashank.
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> camel-vertx-http - a header with several values (a List or an array, such as
> a repeated request header) is sent as one header with the value "[a, b]"
> -----------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25526
> URL: https://issues.apache.org/jira/browse/CAMEL-25526
> Project: Camel
> Issue Type: Bug
> Components: camel-vertx-http
> Reporter: shashank
> Assignee: shashank
> Priority: Major
>
> {{DefaultVertxHttpBinding.populateRequestHeaders}} (lines 120-148 at main
> 586855a18315) copies each message header to the request with
> {{headers.set(key, tc.convertTo(String.class, headerValue))}}. For a header
> whose value is a collection, the String conversion is {{toString()}}, so
> {{List.of("a", "b")}} is sent as the single header line {{X-Test: [a, b]}}; a
> {{String[]}} is sent as {{[Ljava.lang.String;@7112ce6}}. The HTTP consumers
> (platform-http, undertow, servlet, netty-http, vertx-http's own responses)
> map a request header that occurs more than once to a List, so a route that
> forwards such a request with vertx-http (a proxy, or HTTP/2 clients that send
> each cookie in its own {{cookie}} header) sends corrupted header values,
> without any error.
> camel-http ({{HttpProducer}}), camel-netty-http and camel-undertow iterate
> the values with {{ObjectHelper.createIterator(value, null, true)}} and
> {{HttpUtil.applyHeader}} and send one header line per value, and a String as
> one value.
> h3. Reproduction
> New {{VertxHttpMultiValueHeaderTest}} (undertow test server as in the other
> tests, which echoes the values of {{X-Test}} it receives, joined with {{|}}
> when there are several): on main two of the three tests fail, twice:
> {noformat}
> sendsEachValueOfAListHeader: expected: <a|b> but was: <[a, b]>
> sendsEachValueOfAnArrayHeader: expected: <a|b> but was:
> <[Ljava.lang.String;@7112ce6>
> {noformat}
> The third test checks that a String with a comma ({{"a, b"}}) is still sent
> as one value (it passes before and after, and guards the "no delimiter"
> choice of the fix).
> h3. Proposed fix
> Iterate the header value as camel-http does
> ({{ObjectHelper.createIterator(headerValue, null, true)}} with
> {{HttpUtil.applyHeader}}, which applies the header filter per value and skips
> null values) and set all the values of the header. A String or any other
> single value is sent as before. 4.23 upgrade guide note added (a collection
> or array header now gives one header line per value). camel-vertx-http tests
> with the fix: 100, 0 failures (1 skipped, as on main).
> Found with a Lean 4 model of the header copy (a value is a String or a list
> of Strings): "a header is sent as one line per value" (camel-http) fails for
> {{["a", "b"]}}, and main is proved to be wrong for every list value (also a
> one-element list, sent as {{[a]}}). The fix is proved to equal camel-http's
> behaviour for every value and to send the same line as main for every String.
> Confirmed with the real producer.
> Not changed here: camel-knative-http has the same {{toString()}} copy in
> {{KnativeHttpProducer}} and in the reply headers of {{KnativeHttpConsumer}}.
> Affected: main, camel-4.22.x, camel-4.18.x, camel-4.14.x (same code, GitHub
> contents API).
> Duplicate check (2026-10-10): JIRA text "vertx-http" and "header" (44, none
> about multi-value headers; CAMEL-24424 was the REST header filter direction);
> GitHub pull requests "vertx-http header multiple values" (none). No open pull
> request changes {{DefaultVertxHttpBinding}}.
> _Filed with Claude Code on behalf of allthingssecurity._
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